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m in (-oo:+oo)
-10 = m/2-1 // - m/2-1
1-(m/2)-10 = 0
-1/2*m-9 = 0 // + 9
-1/2*m = 9 // : -1/2
m = 9/(-1/2)
m = -18
m = -18
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